👤

Sa se calculeze: sin135°+cos300°+cos240°-cos45°

Răspuns :

[tex]sin(135°)+cos(300°)+cos(240°)-cos(45°)= \\ = \dfrac{\sqrt{2}}{2}+cos(300°)-\dfrac{1}{2}-\dfrac{\sqrt{2}}{2}= \\ = cos(300°)-\dfrac{1}{2}[/tex]